Looking for an ultra-portable recommendation

I'm hoping to splash out on a small laptop in the next couple of months. So far, the ones that have caught my eye are the two Sony ranges, with 10.6" and 13.3" screens. Does anyone have (opinions of) them - or any other ideas? My only reservation is that it must have an internal optical drive, as I think I'll use it quite a lot for watching DVDs on the move.